Some people cheat on their partners. Others wouldn’t dream of it–the risk is too huge. A new video from ASAP Science lays out how genetic differences in the neurotransmitters that promote risk-taking and social bonding might influence people’s willingness to stray.

From an evolutionary standpoint, monogamy doesn't seem to make much sense – especially for males. And yet, it's practiced by a significant number of mammalian species, including humans. Now, in a fantastic example of science in progress, two newly published studies with divergent conclusions seek to explain why.

Often referred to as the "trust hormone," oxytocin is typically associated with helping couples establish a greater sense of intimacy and attachment. Lesser known, however, is its potential role, if any, in preventing couples from cheating. But as a new study from the University of Bonn suggests, it may in fact…

The California mouse and the deer mouse are very similar, except California mice find one partner and mate with them for life, while deer mice take on as many mates as possible. That lifestyle difference has a major biological impact.

People often think that open relationships increase your risk of catching a disease — but actually, openly seeing other people is much safer than sneaking around, a new study proves. According to a study published in the Journal of Sexual Medicine suggests that people in open relationships actually have less of a…

When animals practice monogamy, we can generally tell right away. After all, couples like to hang out together, whether they're humans or squirrels or hawks. But one fish keeps its monogamy so top-secret that researchers actually called their pairings "invisible."

The cleaner shrimp is perfectly happy to live out its life in peace and tranquility with its monogamous partner. But add any more shrimp to the mix — even another happy couple — and the whole thing turns into a bloodbath.